I had a similar problem with electronic locks, but it's very easy to memorize a 8 digit number with a mnemonic - https://en.wikipedia.org/wiki/Mnemonic_major_sy

I had a similar problem with electronic locks, but it's very easy to memorize a 8 digit number with a mnemonic - https://en.wikipedia.org/wiki/Mnemonic_major_system https://en.wikipedia.org/wiki/Mnemonic_major_system